Bulk Spin Polarization of Co$_{(1-x)}$Fe$_x$S$_2$

C. Utfeld; S. R. Giblin; J. W. Taylor; J. A. Duffy; C. Shenton-Taylor; J. Laverock; S. B. Dugdale; M. Manno; C. Leighton; M. Itou; Y. Sakurai

doi:10.1103/PhysRevLett.103.226403

paper

Bulk Spin Polarization of Co $_{(1 - x)}$ Fe $_{x}$ S $_{2}$

arXiv:0911.5251 · doi:10.1103/PhysRevLett.103.226403

Abstract

We report on a new method to determine the degree of bulk spin polarization in single crystal Co $_{(1 - x)}$ Fe $_{x}$ S $_{2}$ by modeling magnetic Compton scattering with {\it ab initio} calculations. Spin-dependent Compton profiles were measured for CoS $_{2}$ and Co $_{0.9}$ Fe $_{0.1}$ S $_{2}$ . The {\it ab initio} calculations were then refined by rigidly shifting the bands to provide the best fit between the calculated and experimental directional profiles for each sample. The bulk spin polarizations, $P$ , corresponding to the spin-polarized density of states at the Fermi level, were then extracted from the {\it refined} calculations. The values were found to be $P = - 72 \pm 6$ and $P = 18 \pm 7$ for CoS $_{2}$ and Co $_{0.9}$ Fe $_{0.1}$ S $_{2}$ respectively. Furthermore, determinations of $P$ weighted by the Fermi velocity ( $v_{F}$ or $v_{F}^{2}$ ) were obtained, permitting a rigorous comparison with other experimental data and highlighting the experimental dependence of $P$ on $v_{F}$ .

Bulk Spin Polarization of Co $_{(1 - x)}$ Fe $_{x}$ S $_{2}$

Abstract

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Bulk Spin Polarization of Co(1−x)​Fex​S2​

Abstract

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Cited by in corpus (8)

Bulk Spin Polarization of Co $_{(1 - x)}$ Fe $_{x}$ S $_{2}$